Patent GB-463087-A (GB)
Title: A free pendulum clock
IPC: G04C13/02
Filed: 1935-11-25
Abstract: 463,087. Clocks. JONES, F. HOPE-. Nov. 25, 1935, No. 32611. [Class 139] A clock which periodically (e.g. once each halfminute) raises and releases a gravity lever D for imparting impulses to a free pendulum F, is synchronized by the further fall of the gravity lever after the latter has delivered an impulse. The clock has two pendulums, one being a slave pendulum A which controls both the time - indicating mechanism and a gravity lever D which latter on release gives an impulse to the second pendulum F and then acts on means L, S to synchronize the slave pendulum F which controls the fall of the gravity lever D and thereby the action of the latter on the said synchronizing means L, S, the gravity lever being thereafter reset automatically. The synchronizing means L, S are preferably of the "hit-and-miss" type set out in Specification 187,814, [Class 139]. In Fig. 1 (Prov.) the gravity lever D is pivoted at d to the scape wheel C which coacts with the anchor B of the half-seconds slave pendulum A ; the scape wheel being driven by weight M<1> on cord N' of drum O, by a spring, by an electro - motor, or by the electromagnetic remontoire set out in Specification 1587/95, [Class 139]. Alternatively, the escapement may be dead beat, half dead beat, or chronometer detent. Lever D has an arm G resting against a fixed pin K. As the scape wheel rotates, arm G passes free of pin K and gravity lever D falls and gives an impulse to the roller P of the seconds, free pendulum F, after which the lever D hits the spring H of the catch L pivoted at J to actuate the hit-and-miss synchronizer L, S. The now pendant lever D is rotated with the scape wheel until the projecting arbor of this wheel picks it up and turns it over so that arm G again falls on to pin K. In a modification, Fig. 2 (Prov.), the gravity lever D is rigid with a partially toothed wheel M coacting with a partially toothed wheel which is rigid with the scape wheel C. When a pin N rocks bell-crank n<1> about pivot n<2> to remove catch K from a pin on lever D, the latter falls to give impulse to roller P and effect synchronization, and then hangs vertically down with the first teeth of its wheel M in the gap of the teeth above. Subsequently the wheel rigid with wheel C rotates the gravity lever D counterclockwise to reset it on catch K. In a further modification, Fig. 3A (Prov.), the gravity lever D is released by a pin N on the scape wheel C rocking a catch lever K, and after lever D has given an impulse to the roller P on the free pendulum and effected synchronization of the slave pendulum, a counterweighted bell-crank Q drops off the high part of a cam R rigid with the scape wheel and lifts and relatches the lever D. In the construction shown in Fig. 1 (Comp.) an arm N rigid with the scape wheel C removes a catch lever n, K from the gravity lever D once each half minute, so that the latter gives an impulse to roller P of free pendulum F and then the arm G actuates the parts L, S to synchronize the slave pendulum A. A pin d<2> on lever D removes catch K<2> from the end K<1> of a lever Q pivoted at q<1> and counterweighted at q<2>. Lever Q thereupon resets the gravity lever D on catch K and itself comes to rest with its arm q<3> against a step A<3> on armature A<1> of magnet M. The driving means for scape wheel C consists of gears C<1>, V, V<1>, U, ratchet wheel V<1> and pawl w<2> on a weight lever W pivoted at w<1>. When lever W reaches the bottom of its path, contact is made at A<2> to energize the magnet M and the armature A<1> throws the lever W clockwise so that pawl W2 takes up over another ratchet tooth. At the same time, armature A<1> throws resetting lever Q counterclockwise so that it is relatched by catch K2.